Base for antistatic film and composition for making the same



srnrs PAUL C. SEEL, OF ROGHEST NEW YORK, ASSIG-NOR TO EASTMAN KODAK COMPANY,

015 ROGHESTER, NEW YORK, A CORPORATION OF NEW YORK.

BASE FOR ANTISTATIG FEM AND COMEOSITION FOR MAKING- THE SAME.

Specification of Letters Patent.

Patented May 9, 1922.

No Drawing. Original application filed December 31, 1920, Serial No. 434,354. Divided and this application filed April 1%, 1921. Serial No. 461,916.

To all whom it may concern:

Be itknown that 1, PAUL 0. Satin, a citizen of the United States of America, residing at Rochester, in. the county of Monroe and State of New York, have invented certain new and use-"ful Improvements in Bases for Antistatic Films and Composition for Making the Same, (Case 3,) of which the following is a full, clear, and exact specification.

This invention relates to a base or support for anti-static photographic film and a composition for preparing such base. The principal object of my invention is to provide a support containing certain anti-static ingredients. -Another object or" my invention 'is to provide a suitable film-forming dope oncomposition for makmg'sueh base or support. Other objects will hereinafter appear.

I have found that photographic film may be rendered substantially anti-static by incorporating in the nitrocellulose base or support thereof certain substances together The -pre; ferred substances which I employ areglucose and glycerin. In place of the glucose analogous sugary substances may be em? ployed and in place of the glycerin I may employ similar organic compounds of low volatility which are-hygroscopic or have a strong affinity for water and are substantially inert toward the photographic coatmgs.

In practice I mix the anti-static ingredients together and} then add such. mixture to anyof the usual nitrocellulose film dopes. In the preferred-embodiment of my invention I add an amount of glucose equal to from 2 to 4% of the weight of the nitrocellulose in the dope, an amount of glycerin equal to from 2 to'4% of the weight of the nitrocellulose in the dope and an amount of water equal to-from2 to 4% of the weight of the nitrocellulose in the dope. Ofcourse, these proportionsare merely illustrative and may be variedconsiderably according to the. thickness. of the dope and the methods of spreading and curing the latter. But the preferredproportions herein described operate well under the standard'film-making conditions. r 1

As an illustration of the formula to which any anti-staticmixture} may be added the following is noted: 100 parts of nitrocellulose, 200 to 400 (say 250) parts of acetone, 200 to 400 (say'250) parts of methyl alcohol, 20 to 200 (say 40) parts of fusel oil. To this may be added, if desired, 1 to 30 (say 10) parts of camphor. My mixture of 4 parts of glucose, 4 parts of glycerin and 4 parts of water is then incorporated thoroughly in the dope.

The ingredients are those commonly used in the art, of sufiicient'purity to yield films of the desired transparency and relative freedom from color. Various volatile sol vents maybe used and either acetone or methyl alcohol can be used alone in a suitable amount or varying mixtures can be employed. For the fusel oil may be substituted the other monohydroxy aliphatic alcohols of from 4 to 5 carbon atoms, like normal butyl and isobutyl alcohols.

The dope is spread and cured by 'the evaporation of the volatile solvents, so as to form a transparent flexible sheet or film base in the usual way. 0n this support the sensitive photographic coatings or emulsions are applied and from the product motion "picture films and other films are prepared as is wellunderstood in the art. Such films are notably resistant to defects from the electrical discharges. While I am inclined to attribute th1s property to the increased electrical conductivity of the film This case isa CllVlSlOIl of my application Serial No. 434,354, filed Dec. 31, 1920.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A flexible transparent nitrocellulose base or support adapted to receive sensitive photographic coatings which cbntains a sugar, an inert hygroscopic organic compound of low volatility and water.'

2. A flexible transparent nitrocellulose base or sup-port adapted to receive sensitive photographic coatings which. contains 'a sugar, glycerin and water.

3. A flexible transparent nitrocellulose of low volatility equal to substantially 4% or less of the Weight of the nitrocellulose and an amountot' water equal to substantially 4% orless of the Weight of the nitrocellulose.

6. A flexible transparent nitrocellulose base or support adapted to receive sensitive coatings which contalns an amount of a sugar equal to approximately 4% or less of the Weight of the nitrocellulose, an amount of glycerin equal to substantially 4% or less of the Weight of the nitrocellulose and an amount of water equal tosubstantially 4% or less of the Weight of the nitrocellulose.

7'. A flexible transparent nitrocellulose base or sup-port adapted to receive sensitive coatings which contains an amount of glucose equal to substantially 4% or less of the Weight of the nitrocellulose, an amount of an inert hygroscopic organic compound of 10W volatility equalto substantially 4% or less of the Weight of the nitrocellulose and an amount of Water equal to substantially 4%for less of the Weight of the nitrocellulose.

8. A flexible transparent nitrocellulosev base or support adapted to receive sensitive coatings whichcontams an amount of glucose equal to substantially 4% or less of the Weight of the nitrocellulose, an amount of glycerin equal to substantially 4% or less of the Weight of the nitrocellulose and an amount of Water equal to substantially 4% or less of the Weight of the nitrocellulose.

9. A flowable fihn-forming' composition of matter comprising nitrocellulose, a vola tile common solvent, a'namount of a sugar qll'ial to app ximately 4% or lesson? the weightiof the nitrocellulose, an amount of an inc t hygroscopic organic compound of low vo atility equal to substantially 4% or less of the weight of the nitrocellulose and an amount (if- Water equal to. substantially 4% or less of the Weight of the nitro-cellulose.

10. A flovvable film-forming composition of matter comprising nitrocellulose, a volatile common solvent, an amount of a sugar equal to approximately 4% or less of the Weight ofthe nitrocellulose, an amount of glycerin equal to substantially 4% or less of the Weight of the nitrocellulose and an amount of Water equal to substantially'4% or less of the Weight of the nitrocellulose.

11. A flovvab-le film-forming composition of matter comprising nitrocellulose, a volatile common solvent, an amount of glucose equal to substantially 4% or less of the Weight of the nitrocellulose, an amount of an inert hygroscopic organic compound of low volatility equal to substantially 4% or less of the Weight of the nitrocellulose and an amount of Water equal to substantially 4% or less of the Weight of the nitrocellulose.'-

12. A flovvable film-forming composition of matter comprising nitrocellulose, a volatile common solvent, an amount of glucose equal to substantially 4% or less of the Weight of the nitrocellulose, an amount of glycerin equal to substantially4% or less of the Weight of nitrocellulose and an amount of water equal to substantially 4% or less of the Weight of the nitrocellulose.

13. A composition of matter comprising 100 parts of nitrocellulose, 200 to 400 parts of acetone, 200 to 400 parts of methyl alcohol, -20 to 200 parts of a. monohydroxy aliphatic alcohol having from 4 to 5 carbon atoms, 1 to 30 equal to substantially 4 cose, glycerin and Water.

14. The process of modifying a flovvable film-forming nitrocellulose dope, which comprises pro-mixing glucose, glycerin and parts or l'ess,--glu Water and then incorporating the mixture with said do e; r

Signed at ochester, New York, this 6th day of April, 1921. v 7 F PAUL 0. SEEL.

parts of camphor, and an amount of each of the following ingredients 

